<template>
  <div :class="className" :style="{ height: height, width: width }" />
</template>

<script>
import echarts from 'echarts'

require('echarts/theme/macarons') // echarts theme
import { debounce } from '@/utils'

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    }
  },
  data() {
    return {
      chart: null
    }
  },
  mounted() {
    this.initChart()
    this.__resizeHandler = debounce(() => {
      if (this.chart) {
        this.chart.resize()
      }
    }, 100)
    window.addEventListener('resize', this.__resizeHandler)
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    window.removeEventListener('resize', this.__resizeHandler)
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')
      const data = [
        {
          name: 'Grandpa',
          children: [
            {
              name: 'Uncle Leo',
              value: 15,
              children: [
                {
                  name: 'Cousin Jack',
                  value: 2
                },
                {
                  name: 'Cousin Mary',
                  value: 5,
                  children: [
                    {
                      name: 'Jackson',
                      value: 2
                    }
                  ]
                },
                {
                  name: 'Cousin Ben',
                  value: 4
                }
              ]
            },
            {
              name: 'Father',
              value: 10,
              children: [
                {
                  name: 'Me',
                  value: 5
                },
                {
                  name: 'Brother Peter',
                  value: 1
                }
              ]
            }
          ]
        },
        {
          name: 'Nancy',
          children: [
            {
              name: 'Uncle Nike',
              children: [
                {
                  name: 'Cousin Betty',
                  value: 1
                },
                {
                  name: 'Cousin Jenny',
                  value: 2
                }
              ]
            }
          ]
        }
      ]
      this.chart.setOption({
        series: {
          type: 'sunburst',
          data: data,
          radius: [0, '90%'],
          label: {
            rotate: 'radial'
          }
        }
      })
    }
  }
}
</script>
